Eye of Tiamat
It was recovered by the Russian archaeologist Alexander Britski who later killed himself rather than be eaten alive by the creature.
See also: Eye of Ra.
The Tomb - The Eye of Tiamat is buried after Colonel Zukov defends himself and O'Neill from the resurrected Marduk.
Full Circle - Anubis uses the six collected Eyes for his new super weapon, which he uses to destroy a fleet of System Lord motherships -- and Abydos.
Fallen - The Eye of Tiamat is believed destroyed when the power core of Anubis's super-weapon overloads and explodes.